John Slick is listed in the credits for the following albums:
| Year | Artist | Album | Role |
|---|---|---|---|
| 1981 | Petra | Never Say Die | String and Horn Arranger, Keyboards, Background Vocals |
| 1982 | Petra | More Power to Ya | Arranger, Keyboards, Synthesizer Programming, Background Vocals |
| 1983 | Petra | Not of This World | Arranger, Songwriter, Keyboards, Background Vocals |
| 1985 | Twenty Twenty | Twenty Twenty | Keyboards |
| 1985 | White Heart | Hotline | Synthesizer Programming |
| 1985 | Joe English | The Best is Yet to Come | Keyboards |
| 1986 | David and Lisa Binion | Nothing Can Separate Us | Synthesizer |
| 1986 | Geoff Moore | Over the Edge | Keyboards |
| 1986 | Petra | Captured in Time & Space | Songwriter |
| 1987 | Geoff Moore | The Distance | Organ |
| 1987 | Margaret Becker | Never For Nothing | Keyboards |
| 1989 | Petra | Petra Means Rock | Arranger, Songwriter, Keyboards, Background Vocals |
| 1990 | Petra | War and Remembrance: 15 Years Of Rock | Arranger, Songwriter, Keyboards, Background Vocals |
| 1991 | Petra | Petrafied: The Best of Petra | Arranger, Keyboards, Synthesizer Programming, Background Vocals |
| 1992 | Petra | Petraphonics | Arranger, Keyboards, Synthesizer Programming, Background Vocals |
| 1993 | Petra | The Power of Praise | Arranger, Songwriter, Keyboards, Background Vocals |
| 1995 | Geoff Moore | Familiar Stranger: The Early Works of Geoff Moore | Hammond B3 |
| 1995 | Petra | Rock Block | Arranger, Songwriter, Keyboards, Background Vocals |
| 1996 | Petra | The Early Years | String and Horn Arranger, Keyboards, Background Vocals |
